<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<body>
    <script type="text/javascript" >
        let person = {
            name:"jack",
            age:21,
            language: ['java','js','css']
        }
        let haha=({name,age}) => console.log('hello'+name+age);
        haha(person);



        let add3 = a=>a+=10;
        let res = add3(11);

        console.log(res)
    </script>
</body>
</html>